The prisoner is bound to an inclined board, feet raised and head slightly below the feet. Cellophane is wrapped over the prisoner's face and water is poured over him. Unavoidably, the gag reflex kicks in and a terrifying fear of drowning leads to almost instant pleas to bring the treatment to a halt.
According to the sources, CIA officers who subjected themselves to the water boarding technique lasted an average of 14 seconds before caving in. They said al Qaeda's toughest prisoner, Khalid Sheik Mohammed, won the admiration of interrogators when he was able to last between two and two-and-a-half minutes before begging to confess.
"The person believes they are being killed, and as such, it really amounts to a mock execution, which is illegal under international law," said John Sifton of Human Rights Watch.
The techniques are controversial among experienced intelligence agency and military interrogators. Many feel that a confession obtained this way is an unreliable tool. Two experienced officers have told ABC that there is little to be gained by these techniques that could not be more effectively gained by a methodical, careful, psychologically based interrogation. According to a classified report prepared by the CIA Inspector General John Helgerwon and issued in 2004, the techniques "appeared to constitute cruel, and degrading treatment under the (Geneva) convention," the New York Times reported on Nov. 9, 2005.
It is "bad interrogation. I mean you can get anyone to confess to anything if the torture's bad enough," said former CIA officer Bob Baer.

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It sounds pretty dreadful but pales to insignificance compared to this;

The detainees were also forced to listen to rap artist Eminem's "Slim Shady" album. The music was so foreign to them it made them frantic, sources said.